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How to test if one java class extends another at runtime?
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tricked ya ;-p Many thanks for the detailed answer; I'm accepting meriton's though, as it is the clearest IMO.
– Armand
Aug 18 '10 at 9:12
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Check that Field Exists with MongoDB
...er, I'm pretty sure most of them shield you from the cursor implementation detail.
– Sergio Tulentsev
Feb 3 '16 at 6:36
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Android gradle: buildtoolsVersion vs compileSdkVersion
...(tab). Select Android SDK Build Tools from the list and check Show Package Details. The last item will show the most recent version.
In the image above, I can see that I have buildToolsVersion 27.0.3 installed. There is a more recent rc (release candidate) version, but I haven't installed it. I w...
Why doesn't Mockito mock static methods?
.... Such a facade keeps client code away from the complexities and low-level details of an ORM API, providing a more consistent and easy to use API, while allowing lots of flexibility.
– Rogério
Mar 15 '11 at 14:12
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Can I concatenate multiple MySQL rows into one field?
...AT if your MySQL version (4.1) supports it. See the documentation for more details.
It would look something like:
SELECT GROUP_CONCAT(hobbies SEPARATOR ', ')
FROM peoples_hobbies
WHERE person_id = 5
GROUP BY 'all';
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Find difference between timestamps in seconds in PostgreSQL
...y:
SELECT EXTRACT(EPOCH FROM (timestamp_B - timestamp_A))
FROM TableA
Details here: EXTRACT.
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What causes javac to issue the “uses unchecked or unsafe operations” warning
...ts and recompile with the "-Xlint:unchecked" switch, it will give you more detailed information.
As well as the use of raw types (as described by the other answers), an unchecked cast can also cause the warning.
Once you've compiled with -Xlint, you should be able to rework your code to avoid the ...
How to export collection to CSV in MongoDB?
...should use --type=csv instead of --csv since it has been deprecated.
More details: https://docs.mongodb.com/manual/reference/program/mongoexport/#export-in-csv-format
Full command:
mongoexport --host localhost --db dbname --collection name --type=csv --out text.csv --fields firstName,middleName,l...
How do I get the MIN() of two fields in Postgres?
...mmon data type, which will be the type of the result (see Section 10.5 for details). NULL values in the list are ignored. The result will be NULL only if all the expressions evaluate to NULL.
Note that GREATEST and LEAST are not in the SQL standard, but are a common extension. Some other databa...
Mipmap drawables for icons
...wnsized duplicate of the
main texture, but at a certain reduced level of detail. Although the
main texture would still be used when the view is sufficient to render
it in full detail, the renderer will switch to a suitable mipmap image
(...) when the texture is viewed from a distance or at a...